Closure-locking means.



C. J. LJUNGGREN.

GLOSURE LOOKING MEANS.

APPLICATION FILED APR.15, 1910.

991,448, Patented May 2, 1911.

f \X/ITNEEEEE. Mm; WWW. F T' W Y 1H; NORRIS PETERS co WASHINGTON c CAR-LJ. -LJUNGGRE1\T, 0F PROVIDENCE, RHODE ISLAND.

CLOSURE-LOOKING MEANS.

Specification of Letters Patent.

Patented May 2, 1911.

Original application filed September 2, 1908, Serial No. 451,444.Divided. and this application filed April 15, 1910. Serial No. 555,562.

To all whom it may concern:

Be it known that I, CARL J. LJUNGGREN, a subject of the King of Sweden,residing at Providence, in the county of Providence and State of RhodeIsland, have invented certain new and useful Improvements inClosure-Locking Means, of which the following is a specification.

My invention relates to closure locking means adapted for use in vaults,s, ports, etc., and constitutes a division of my pending patentapplication Serial Number 451,444- filed Sept. 2, 1908. In structures ofthis character peripheral screw threads solely have been found aninsufficiently secure interengaging means for the interlocking' members,especially when the parts are subjected to sudden or powerful shocks.The requisite strength and adaptability for perfect seating, I havefound, is attainable by a particular arrangement of screw threads uponportions only of graduated steps. I have further discovered that thedifficulty and attendant expense of forming these threads are lessenedby their peculiar arrangement upon the steps.

My invention, therefore, consists of a de vice possessing claimedfeatures of construction and relative arrangement of parts, one form ofsaid device being illustrated by the accompanying drawings which form apart of this specification, and now to be described in detail.

Figures 1 and 2 are rear and side elevations respectively of a novelplug or closure member, Fig. 3, a rear end elevation of the stationarymember, Fig. 4:, a section of same on line at m of Fig. 3, Fig. 5, arear elevation of the closure member locked in the receiving member, andFig. 6, a section on y y of Fig. 5.

Like letters of reference indicate like parts throughout the views.

My invention in its present embodiment comprises a plug, door or closuremember A cooperating with a jamb or breechB. The usual supporting,inserting, and rotating mechanisms employed in connection with theseparts are herein not shown, as they are well known in the art and formno part of the present invention.

The member A, which is cylindrical in form, is provided with a pluralityof annularly arranged interspaced segments O. Each segment comprises aplurality of radially graduated longitudinally disposed steps D, E, F,of graduated lengths whose front faces 01, e, f, are in the same plane,and whose rear faces or shoulders 03 e, f, respectively are diagonallydisposed with relation to each other and are transversely inclined. Anauxiliary or initial step G formed continuous with the step F and havinga rear face 9' is herein shown and is found convenient, but may beomitted without departing from the spirit of my invention. The steps Eand F are successively longer and lower than the step D, and the outerfaces or peripheries of the steps D, E, F, and G, are provided withscrew threads d 0 f and g respectively.

The threads d of the highest and shortest step D cover the entireperiphery of the latter. The threads 6 of the next longer and lower stepE extend over the periphery of that portion of the step which projectsbeyond the step D. The threads f are located only upon that portion ofthe periphery of the step F which projects beyond the step E. Thethreads 9 extend throughout the length of the step G.

The stationary member comprises the collar B fixed in the wall I whoseouter and inner surfaces are at c and 2' respectively. The member B hasa cylindrical orifice J provided with a circumferential series ofradially graduated longitudinally disposed entrance channels K, L, M,corresponding respectively with the steps D, E, F. Within the orifice Jthe member B has a plurality of seats N, O, P, graduated both radiallyand longitudinally, and opening respectively into the channels K, L, M.The outer ends of these seats form transversely disposed inclinedabutments n, 0, p The channel P at its outer end is still further recessed to form an auxiliary seat Q. The seats N, O, P, and Q, areprovided with screw threads n, 0, p, and g, respectively adapted toengage the threads d 6 f and The threads 0 and p, it will be noted,extend over only a portion of their respective seats. The parts A and Bare thus intereng'aged. The member A, disposed as in Fig. 2, isintroduced as a sliding fit into the member B from right to left asviewed in Fig. 6, the steps D, E, F, entering respectively the openingsK, L, M. The member A is then turned in the direction of the arrow shownin Fig. 5 bringing the steps D, E, F and G into their respective seatsN, O, P and Q, and the threaded portions 0?, '0 f and 9 into engagementwith the threads n, 0, p and What I claim is,

In a device of the type set forth, the combination with a stationarymember, of a closure body, and a segment upon the body comprising steps,said steps being graduated both radially and longitudinally, one i stepbeing provided with peripheral threads, 1

and that portion only of each remaining step which projects beyond theadjacent step being provided with threads upon its 1 periphery.

In testimony whereof I have affixed my signature in presence of twowitnesses.

CARL J. LJUNGGREN.

\Vitnesses HonA'rio E. BELLOWS, GEORGE H. MOLAUGHLIN.

Copies of tliis patent may be obtained for five cents each, byaddressing the Commissioner of Patents, Washington, I). G.

